package src.stu23002149.chapter07;

import java.util.ArrayList;
import java.util.Collections;

public class Demo22 {
        public static void main(String[] args) {
            ArrayList<String> list = new ArrayList<>();
            Collections.addAll(list, "C","Z","B","K");    // 添加元素
            System.out.println("排序前: " + list);
            Collections.reverse(list);                       // 反转集合
            System.out.println("反转后： " + list);
            Collections.sort(list);                           // 按自然顺序排列
            System.out.println("按自然顺序排序后: " + list);
            Collections.shuffle(list);                       // 随机打乱集合元素
            System.out.println("按随机顺序排序后:  " + list);
            Collections.swap(list, 0, list.size()-1);     // 将集合首尾元素交换
            System.out.println("集合首尾元素交换后: " + list);
        }

}
